282815
The lateral displacement of light passing through a parallel plane of glass of thickness \(t\) with angle of incidence \(\mathbf{6 0}^{\circ}\) and angle of refraction \(45^{\circ}\) is
282816
An object is placed \(10 \mathrm{~cm}\) from a lens. The size of the image is same as the size of the object. The power of the lens should be
1 \(+20 \mathrm{D}\)
2 \(-20 \mathrm{D}\)
3 \(+10 \mathrm{D}\)
4 \(-10 \mathrm{D}\)
Explanation:
A: Given, size of image \(=\) size of object This is possible only if object is placed at ' \(2 \mathrm{f}\) '
\(\begin{aligned}
\therefore \quad 2 \mathrm{f} & =10 \mathrm{~cm} \\
\mathrm{f} & =5 \mathrm{~cm}
\end{aligned}\)
(given)
Power \((\mathrm{P})=\frac{100}{\mathrm{f}}=\frac{100}{5}\)
\(\mathrm{P}=+20 \mathrm{D}\)
SCRA-2013
Ray Optics
282817
Rainbow is formed due to :
1 total internal reflection
2 scattering
3 refraction
4 dispersion and total internal reflection
Explanation:
D: Rainbow is combination of different phenomena- dispersion, refraction and reflection of light
The rainbow appears in the sky after a rain shower. When sunlight enters the water droplets presents in the atmosphere. They refract and disperse the incident sunlight.
As a collective effect of all these phenomena, the seven colour rainbows are observed.
Karnataka CET-2004
Ray Optics
282818
When sunlight is scattered by minute particles of atmosphere, the intensity of light scattered away is proportional to
1 (wavelength of light) \({ }^4\)
2 (frequency of light) \({ }^4\)
3 (wavelength of light) \({ }^2\)
4 (frequency of light) \({ }^2\)
Explanation:
B: According to Rayleigh scattering, Intensity \(\propto\) (frequency of light) \({ }^4\)
J\&K CET- 2010
Ray Optics
282819
Red colour is used for danger signals because
1 it causes fear
2 it undergoes least scattering
3 it undergoes maximum scattering
4 it is in accordance with international convention
Explanation:
B: Since, red colour light has maximum wavelength than others, so that it scatters least and can be seen through large distance.
Hence, red colour is used for danger signals.
282815
The lateral displacement of light passing through a parallel plane of glass of thickness \(t\) with angle of incidence \(\mathbf{6 0}^{\circ}\) and angle of refraction \(45^{\circ}\) is
282816
An object is placed \(10 \mathrm{~cm}\) from a lens. The size of the image is same as the size of the object. The power of the lens should be
1 \(+20 \mathrm{D}\)
2 \(-20 \mathrm{D}\)
3 \(+10 \mathrm{D}\)
4 \(-10 \mathrm{D}\)
Explanation:
A: Given, size of image \(=\) size of object This is possible only if object is placed at ' \(2 \mathrm{f}\) '
\(\begin{aligned}
\therefore \quad 2 \mathrm{f} & =10 \mathrm{~cm} \\
\mathrm{f} & =5 \mathrm{~cm}
\end{aligned}\)
(given)
Power \((\mathrm{P})=\frac{100}{\mathrm{f}}=\frac{100}{5}\)
\(\mathrm{P}=+20 \mathrm{D}\)
SCRA-2013
Ray Optics
282817
Rainbow is formed due to :
1 total internal reflection
2 scattering
3 refraction
4 dispersion and total internal reflection
Explanation:
D: Rainbow is combination of different phenomena- dispersion, refraction and reflection of light
The rainbow appears in the sky after a rain shower. When sunlight enters the water droplets presents in the atmosphere. They refract and disperse the incident sunlight.
As a collective effect of all these phenomena, the seven colour rainbows are observed.
Karnataka CET-2004
Ray Optics
282818
When sunlight is scattered by minute particles of atmosphere, the intensity of light scattered away is proportional to
1 (wavelength of light) \({ }^4\)
2 (frequency of light) \({ }^4\)
3 (wavelength of light) \({ }^2\)
4 (frequency of light) \({ }^2\)
Explanation:
B: According to Rayleigh scattering, Intensity \(\propto\) (frequency of light) \({ }^4\)
J\&K CET- 2010
Ray Optics
282819
Red colour is used for danger signals because
1 it causes fear
2 it undergoes least scattering
3 it undergoes maximum scattering
4 it is in accordance with international convention
Explanation:
B: Since, red colour light has maximum wavelength than others, so that it scatters least and can be seen through large distance.
Hence, red colour is used for danger signals.
282815
The lateral displacement of light passing through a parallel plane of glass of thickness \(t\) with angle of incidence \(\mathbf{6 0}^{\circ}\) and angle of refraction \(45^{\circ}\) is
282816
An object is placed \(10 \mathrm{~cm}\) from a lens. The size of the image is same as the size of the object. The power of the lens should be
1 \(+20 \mathrm{D}\)
2 \(-20 \mathrm{D}\)
3 \(+10 \mathrm{D}\)
4 \(-10 \mathrm{D}\)
Explanation:
A: Given, size of image \(=\) size of object This is possible only if object is placed at ' \(2 \mathrm{f}\) '
\(\begin{aligned}
\therefore \quad 2 \mathrm{f} & =10 \mathrm{~cm} \\
\mathrm{f} & =5 \mathrm{~cm}
\end{aligned}\)
(given)
Power \((\mathrm{P})=\frac{100}{\mathrm{f}}=\frac{100}{5}\)
\(\mathrm{P}=+20 \mathrm{D}\)
SCRA-2013
Ray Optics
282817
Rainbow is formed due to :
1 total internal reflection
2 scattering
3 refraction
4 dispersion and total internal reflection
Explanation:
D: Rainbow is combination of different phenomena- dispersion, refraction and reflection of light
The rainbow appears in the sky after a rain shower. When sunlight enters the water droplets presents in the atmosphere. They refract and disperse the incident sunlight.
As a collective effect of all these phenomena, the seven colour rainbows are observed.
Karnataka CET-2004
Ray Optics
282818
When sunlight is scattered by minute particles of atmosphere, the intensity of light scattered away is proportional to
1 (wavelength of light) \({ }^4\)
2 (frequency of light) \({ }^4\)
3 (wavelength of light) \({ }^2\)
4 (frequency of light) \({ }^2\)
Explanation:
B: According to Rayleigh scattering, Intensity \(\propto\) (frequency of light) \({ }^4\)
J\&K CET- 2010
Ray Optics
282819
Red colour is used for danger signals because
1 it causes fear
2 it undergoes least scattering
3 it undergoes maximum scattering
4 it is in accordance with international convention
Explanation:
B: Since, red colour light has maximum wavelength than others, so that it scatters least and can be seen through large distance.
Hence, red colour is used for danger signals.
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Ray Optics
282815
The lateral displacement of light passing through a parallel plane of glass of thickness \(t\) with angle of incidence \(\mathbf{6 0}^{\circ}\) and angle of refraction \(45^{\circ}\) is
282816
An object is placed \(10 \mathrm{~cm}\) from a lens. The size of the image is same as the size of the object. The power of the lens should be
1 \(+20 \mathrm{D}\)
2 \(-20 \mathrm{D}\)
3 \(+10 \mathrm{D}\)
4 \(-10 \mathrm{D}\)
Explanation:
A: Given, size of image \(=\) size of object This is possible only if object is placed at ' \(2 \mathrm{f}\) '
\(\begin{aligned}
\therefore \quad 2 \mathrm{f} & =10 \mathrm{~cm} \\
\mathrm{f} & =5 \mathrm{~cm}
\end{aligned}\)
(given)
Power \((\mathrm{P})=\frac{100}{\mathrm{f}}=\frac{100}{5}\)
\(\mathrm{P}=+20 \mathrm{D}\)
SCRA-2013
Ray Optics
282817
Rainbow is formed due to :
1 total internal reflection
2 scattering
3 refraction
4 dispersion and total internal reflection
Explanation:
D: Rainbow is combination of different phenomena- dispersion, refraction and reflection of light
The rainbow appears in the sky after a rain shower. When sunlight enters the water droplets presents in the atmosphere. They refract and disperse the incident sunlight.
As a collective effect of all these phenomena, the seven colour rainbows are observed.
Karnataka CET-2004
Ray Optics
282818
When sunlight is scattered by minute particles of atmosphere, the intensity of light scattered away is proportional to
1 (wavelength of light) \({ }^4\)
2 (frequency of light) \({ }^4\)
3 (wavelength of light) \({ }^2\)
4 (frequency of light) \({ }^2\)
Explanation:
B: According to Rayleigh scattering, Intensity \(\propto\) (frequency of light) \({ }^4\)
J\&K CET- 2010
Ray Optics
282819
Red colour is used for danger signals because
1 it causes fear
2 it undergoes least scattering
3 it undergoes maximum scattering
4 it is in accordance with international convention
Explanation:
B: Since, red colour light has maximum wavelength than others, so that it scatters least and can be seen through large distance.
Hence, red colour is used for danger signals.
282815
The lateral displacement of light passing through a parallel plane of glass of thickness \(t\) with angle of incidence \(\mathbf{6 0}^{\circ}\) and angle of refraction \(45^{\circ}\) is
282816
An object is placed \(10 \mathrm{~cm}\) from a lens. The size of the image is same as the size of the object. The power of the lens should be
1 \(+20 \mathrm{D}\)
2 \(-20 \mathrm{D}\)
3 \(+10 \mathrm{D}\)
4 \(-10 \mathrm{D}\)
Explanation:
A: Given, size of image \(=\) size of object This is possible only if object is placed at ' \(2 \mathrm{f}\) '
\(\begin{aligned}
\therefore \quad 2 \mathrm{f} & =10 \mathrm{~cm} \\
\mathrm{f} & =5 \mathrm{~cm}
\end{aligned}\)
(given)
Power \((\mathrm{P})=\frac{100}{\mathrm{f}}=\frac{100}{5}\)
\(\mathrm{P}=+20 \mathrm{D}\)
SCRA-2013
Ray Optics
282817
Rainbow is formed due to :
1 total internal reflection
2 scattering
3 refraction
4 dispersion and total internal reflection
Explanation:
D: Rainbow is combination of different phenomena- dispersion, refraction and reflection of light
The rainbow appears in the sky after a rain shower. When sunlight enters the water droplets presents in the atmosphere. They refract and disperse the incident sunlight.
As a collective effect of all these phenomena, the seven colour rainbows are observed.
Karnataka CET-2004
Ray Optics
282818
When sunlight is scattered by minute particles of atmosphere, the intensity of light scattered away is proportional to
1 (wavelength of light) \({ }^4\)
2 (frequency of light) \({ }^4\)
3 (wavelength of light) \({ }^2\)
4 (frequency of light) \({ }^2\)
Explanation:
B: According to Rayleigh scattering, Intensity \(\propto\) (frequency of light) \({ }^4\)
J\&K CET- 2010
Ray Optics
282819
Red colour is used for danger signals because
1 it causes fear
2 it undergoes least scattering
3 it undergoes maximum scattering
4 it is in accordance with international convention
Explanation:
B: Since, red colour light has maximum wavelength than others, so that it scatters least and can be seen through large distance.
Hence, red colour is used for danger signals.